Effect of 1-pyrrolidine dithiocarbamate on the galvanic coupling resistance of intermetallics – Aluminum matrix during corrosion of AA 2024-T3 in a dilute NaCl

Abstract

a b s t r a c t 1-pyrrolidine dithiocarbamate (PDTC) effect on galvanic coupling resistance of AA 2024-T3 alloy in 0.2 g L À1 NaCl was evaluated by different electrochemical/gravimetric methods and surface analysis. The results obtained from polarization curves and electrochemical quartz crystal microbalance measurements showed that PDTC forms an adsorbed film on the Cu-rich particles, likely through a Cu I -PDTC complex. At high concentrations, PDTC significantly decreases the alloy reactivity thereby providing a marked corrosion protection. SEM-EDX analysis showed that PDTC adsorbs preferentially on the Al-Cu-Mg particles. Electrochemical impedance spectroscopy measurements corroborate these results and show furthermore that PDTC addition increases the galvanic coupling resistance.

Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media

“…In previous works we showed that the protective effect of PDTC might be explained by the formation of a highly stable Cu I -PDTC complex on copper surface that leads to decrease in rate of anodic dissolution and of oxygen reduction reaction [35,36]. Moreover, we carried out similar studies on AA 2024-T3 aluminium alloy that showed good corrosion protection by PDTC thanks to the formation of an adsorbed layer on Cu-rich particles [37].…”

Analisis Kandungan Sodium Dan Klorida Pada Pendingin Primer RSG Gas Untuk Mengetahui Kemurniannya

“…The pitting corrosion can be anticipated. In general, the stage of pitting corrosion is initiated by adsorption of chloride ions on the surface of the oxide layer then the penetration of chloride ions in the oxide layer and the last is a chloride leaching below the surface of the metal oxide layer and essentially [20,21] . Sodium is not corrosive substance.…”

Electrochemical and DFT studies of quinoline derivatives on corrosion inhibition of AA5052 aluminium alloy in NaCl solution

“…However, AA5052 alloy has low corrosion resistance. Some aggressive ions such as chloride ions, can attack the alloy surface resulting in corrosion [7]. Corrosion inhibitors are often used as a cost-effective way to protect aluminium alloy.…”